File Content Extraction 25.1
Filter SDK C Programming Guide

# fpOpenDocumentFromStream()

Creates a `KVDocument` from a stream.

The `KVDocument` type is an opaque pointer that represents a single document. You can pass the `KVDocument` into other functions in the Filter API to perform operations with that document.

## Syntax

    KVErrorCode (pascal* fpOpenDocumentFromStream)(
        KVFilterSession session,
        KVInputStream* pInput,
        KVDocument* ppDocument);

## Arguments

`session` | A Filter session that you initialized by calling fpInit().
`pInput` | A pointer to a KVInputStream. Before calling this function you must create an input stream by using code similar to that in the Filter sample program.
`ppDocument` | A pointer to a `KVDocument`.

## Returns

The return value is an error code.

- If the call is successful, the return value is `KVError_Success` and the `KVDocument` is stored in `*ppDocument`.
- If the call is unsuccessful, the return value is an error code and `*ppDocument` is set to NULL.

## Discussion

- After creating a `KVDocument` from a stream, you must not use the input stream for anything else until you have closed the document by calling fpCloseDocument().
- When you no longer need the `KVDocument`, call fpCloseDocument() to free the memory that was allocated by this function.
- The Filter session must outlive the `KVDocument` created by this function. In other words, you must call fpCloseDocument() on the `KVDocument` before calling fpShutdown() on the Filter session (`session`) that was used to create it.

## Example

The following example demonstrates the creation of a `KVDocument` from a stream.

    KVDocument pDocument = NULL;
    error = fpOpenDocumentFromStream(session, pInput, &pDocument)

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Version 25.1 | Last updated January 2025

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Product: File Content Extraction 25.1

Topic Title: fpOpenDocumentFromStream()